Complete compact adjustable boiler superheater



Nov. 19, 1940. w. A. JONES 2,222,349

COMPLETE COMPACT ADJUSTABLE BOILER SUPERHEATER Filed Oct. l5, 1958 3 Sheets-Sheet l INVENToR Nov. 19, 1940. Y w. A. JONES 2.222,349

COMPLETE COMPACT` ADJUSTABLE BOILER SUPERHEATER Filed Oct. 15; 1958 3 sheets-sheet 2 Nov. 19, 1940. 2,222,349

COMPLETE COMPACT ADJUSTABLE BOILER SUPERHEATER wf A. JoNEs Filed oct. 15, 1958 s sheds-sheet s .Patented Nov. 19, 1940 UNITED STATES PATENT OFFICE COMPLETE COMPAC''JII ADJUSTABLE BOILER SUPERHEATER 7 Claims.

My invention is a development of the Adjustable boiler superheater, for which United States Patent No. 1,929,532 was granted to me Oct. 10, 1933, which dominates this application.

Thisrdevelopment is for a complete unit including, a furnace in which fuel is burned and whose surfaces are lined with vertical helical coils of tube supplied with water at their lower ends, through a iloatvalve above, and which discharge superheated steam through an adjustable automatic thermostatic valve at their upper ends which valve adds a resistance of flow depressing the water within the tubes enough to give sufficient surface of tubes filled with steam to give the required superheat to the steam from radiation, an intermediate gas pass, similar to the fur nace pass but, in which gases flow upward and in which the water Within the tubes is depressed by a manually adjustable valve adding a resistance of flow of steamA to mingle with the steam from the tubes of the furnace pass, and a convection pass in which gases ow downward and which is filled with vertical helical coils of tubes which are supplied with water at their lov :r ends and discharge superheated steam throughv an adjustable automatic thermostatic valve at their upper ends which adds a resistance of ow depressing the water within the tubes enough to give sufflcient surface of tubes filled with steam to give the required superheat.

The water supplied to the lower ends of all helical coils has a pressure due to its height below the float valve, and the pressure equivalent of its downward velocity, in addition tothe steam outlet pressure.

The float valve is shown with the float supported by a spring and by a water pressure cylinder below, which is supplied with water of feed pressure through a central tube.

A manually operated'pilot valve controls the flow of feed water from this pressure cylinder to the boiler so that when the manually operated pilot valve is opened, wide, the float valve opens and floods all helical tubes, the upper headers and the drum or final header, washing them out through the blow off valve.

When the pilot valve is closed tight. the pressure in the cylinder rises and closes the oat valve. A slight opening of the pilot valve reduces the pressure in the cylinder so that the 1 float valve maintains the desired level of feed water above the bottom of the helical coils.

Evidently a separate valve could be used for flooding.

The surface to give the' required superheat ing heat by convection.

When gases pass upward in the furnace, they may pass downward in the economizer section without an intermediate pass.

When gases pass downward in the furnace, an 15 intermediate upward pass may conduct the gases upward so that they can pass downward in the economizer section, with less total height than would result from the economizer section being below the furnace. l 20 Where an intermediate pass is used, a separate adjustable valve may control the flow of steam from the intermediate pass to mingle with the steam from the furnace beyond which it will pas/sf through the adjustable automatic thermostat'c 25 valve which controls the temperature of the superheated steam from the furnace surface.

In general the extent of the surface vto give the desired superheat from radiant heat will be less than the surface required to give the same super- 30 heat by convection from the cooler gases beyond the furnace, and therefore this valve for the steam from the intermediate pass will be required to depress the water level in the helical elements in the intermediate pass below the Water 35 level in the helical elements which line the furnace.

An arrangement with an intermediate pass is illustrated in the drawings accompanying 'this application. 40

Referring to the accompanying drawings;

Figs. 1 and 2 are upper and lower parts of a side view with part of the height broken out to avoid too small a scale. f

Fig. 3 isa part plan view, partly in section on 45 lines, 2l--2l and 22-22, through the horizontal center of the drum or final header, partly in section on lines 4l-4l and 42-42, through the access door in the front wall at the bottom of the furnace and .through tubes directly below the 50 upper horizontal headers, partly in section on line, 6 6, showing tubes, of the furnace and of the intermediate pass, entering the lower horizontal headers, and partly in section on line, '1 -1.,

showing tubes, of the intermediate pass and"of 1.5.5

the convection pass, entering lower horizontal headers and with bale plate between.

Figs. 4, 5, 6, and 7'are four parts of a sectional front view with spaces between to avoid too small a scale, on line 5-5. Fig. 8 is a part sectional plan view showing to a larger scale, a helical element made of six concentric coiled tubes and the enclosing casing having inner and outer metal plates with-insulation f 10 between. Fig. 9 is' a part sectional side view of this arrangement. Tubes may connect to horiz'ontal headers in two or more lines,

Fig. 10 is a part sectional plan view showing, to a larger scale, helical elements each made of four coils with centers of alternate coils offset, and with the enclosing metal casing and insulation. Fig. 11 is a part plan View of an adjustable float valve for controlling the feed supply.

Fig. 12 is an enlarged part sectional elevation yof the float valve for controlling the feed supply. Like reference characters indicate like parts in the several views. In the complete compact adjustable boiler superheater, which I have chosen for purposes of illustration, feed pipe, I, supplies liquid to float valve, 2, maintaining level, 3, of liquidin container, 4, ,having a horizontal part, 5, supplying liquid to headers, 6, 6a, 6b, and 6c, 6d, 6e, 6j,

which supply liquid to the lower ends of vertical helical coils 9, 9a, 9b, 9c, 9d, 9e, 3f, and 9g.

Upper ends of coils 9, 9a, and 9b in the fur.

nace are connected to upper headers II, IIa, and |Ib, which discharge into space, I4, of drum or final header, I2, and thence through thermostatic valve, I3, to space, I5 and outlet nozzle, 31.

Screwed plugs, p6, and pli," close headers at ends away from drum or final header.

Plates, 23, 23a, and 23h, attached to drum or nal header, I2, prevent the ow of steam from space, I4, I4a, and |41?, to space, I5, except through valves, |3, |3a, and |31). These valves as shown cannot be completely closed.VV

Thermostatic valve, I3, is represented as a plate, I1, with hub sliding on sleeve, |8, which has a hub, I9, at its inner end limiting the position to which plate, |1, can be moved towards the plate, 23, bya spring, 20, between plate, |1,'and l a distance sleeve, 2|, extending to the drum or nal header, end plug, 26.

Outer end of sleeve,. I8, is adjustably located by hand wheel, 3|, with differential screw.

Feed pipe,l I, inside of sleeve, IB, and distance sleeve, 2|, insurevthat sleeve, I8, will be cooler than the drum orfinal header and will not expand endways as much from the heat of the steam. y.An outer sleeve, 24, further insulates sleeve, I8, from the heat of the steam.

Holes, 25, in plate, 23, are not opposite to similar holes in plate, I1, andthe area for steam flow is controlled by the distance between the plates and thus permits more flow of steam to space, I5, as the distance between plates, |11 and 23, increases with the expansion of the drum or nal header and differential screw enables this space to be very nely adjusted. Thermometers, 51, 51a, 51p, and 61e, indicate the temperature of the steam and will guide the operator in adjusting the valves, I3, |3a, and

The thermostatic valve, |31), for depressing the water level, |6b, in the economizer section is just as described for valve, I3, witl'iseparateA differential adjusting screw hand wheel, 3Ib, for

depressing the water level, |6b, to give the' same superheat from the cooler gases in this pass. Y

Figures in this case are followedI by the letter, b.

Upper ends of coils, 9b, 9a, 9c, of .the intermediate -pass are connected to headers, ||c, and Ild, which discharge into space, |4a, and thence through adjustable valve, I3a, whose function it is to maintain such a pressure in space, |4a, over the pressure in space, I4, as will cause the level, |6a, of the liquid in these helical coils, 9b, 9a., 9c. of the intermediate pass to be suflciently below the level, I6,.to compensate for the cooler gases in the intermediate pass as compared with the furnace.

Thermometers, 51 and 51a, will show when Valve, |3a, is properly adjusted to give the required temperature of steam in space, |4 a, Without the necessity of this valve Ibeing thermostatic, which would be less simple.

Nozzles, 36 and 36h, connect to safety valves above the pressure spaces, I4 and I4b.

' Screwed plugs, 26 and 26h, with soft packing, 21 and 21h, are represented as closing the ends of the steam drum or final header, I2.

Glands, 28 and 2817, with packing, 2 9 and 29D, are represented where sleeves, 2| and 2lb, pass through drum or final header end plugs, 26 and 26h.

Packings, Ia and Ib, prevent leakage at feed pipe, I.

A gland,28a, and packing, 29a, prevent steam leakage where yvalve stem, passes through Tube, 30, drains drum or final header, I2, to

container, 4, of float valve,'2.

Drain and blo'woi valve, 55, permits all liquid to be drained away. A 1

Fig. 12, shows a spring, |00, for supporting the vweight of the floatA valve, 2, and a cylinder, I,0|, slightly more than balancing the feed pressure on the top of the valve, by feed pressure passing down through pipe, |02, and through holes,

|03. K Holes, |06, discharge liquid downward, from valve, |04, so that this liquid will induce a downward iiow of liquid in pipe, 4, superimposed over the downward flow caused by the weight of the liquid.

A valve, |04, operated by handwheel, |05, and screwed valve stem, controls iiow of feed water' from cylinder, IDI, -so that when valve, 4|04, is opened oat valve, 2, opens and floods all helical coils and spaces in the steam drum i or final header, washing them out through drain valve,

55. In Fig. 9, elements each made of six concentric helixes, 9g, illustrate the possibility of closecoiled of lower transverse beams, 42 and"43.

Columns, 64 and 65, support other ends of beams, 40, 4|, 42, and 43.

Longitudinal beams, 44 and 45, support upper headers, Il, lla, IIb, llc, Hd and Ile.

Longitudinal beams, 46 and 41, support lower headers, 6, 6a, 6b, 6c, 6d, 6e and S.

u Fuel burner, 48, is represented at the top of the furnace and door, 49, in the wall at the bottom of the furnace.

Spent gas outlet, 50, is shown at. the lower part of the economizer section.

10 Evidently the thermostatic valve may be operated by the diierence in expansion of bronze and of steel members heated by the steam or by the diierence in expansion of any two members due to diierence of temperature or of difference l5 of material or of both.

As stated above, the intermediate pass may be omitted, and the apparatus described may bel otherwise varied without departing from my invention.

20 Evidently the coils may discharge steam directly into the drum or final header without intermediate headers and the nal header need not be large enough for a man to enter it if the inner parts are designed to be assembled outside 25 and inserted from the end or ends of the final header.

I claim: 1. In combination, in a complete compact adjustable boiler superheater, 'for heating a liquid v 30 to its boiling temperature, evaporating the liquid into vapor and superheating the vapor to the desired temperature above the boiling temperature, means providing a passage for gases flowing in series through, a furnace chamber lined 35 with vertical helixes of multiple tubes, forming one group of tubes, an intermediate chamber lined with vertical tubularv helixes, alternately right hand and left hand and with offset centers, forming another group of tubes, and a con- 0 vection chamber through which gases ow downward and which is lled with vertical tubular helixes, alternately right hand and left hand and with offset centers and having more length of tube per foot of height in the lower part than 45 in the upper part, forming another group of tubes, all helixes being supplied with liquid of constant headto their lower ends, and being connected to a header at their upper ends, and with the upper end of each group discharging 50 vapor into a separate vapor space in the header for that group and thence, either directly through an adjustable thermostatic valve, or through a manually operated valve into a space in the header in which the pressure is maintained by such an adjustable thermostatic valve, responsive to the temperature of the vapor discharged into said space, thus depressing the liquid within each group o-f tubular helixes enough to give suficientI vapor lled surface to G give the required outlet temperature of vapor above the boiling temperature, and means providing for washing out the boiler.

2. In combination, in a complete compact adjustable boiler superheater, for heating a liquid (15 to its boiling temperature, evaporating the liquid into vapor and superheating the vapor to the desired temperature above the boiling temperature, means providing a passage for gases ilowing in series through, a furnace chamber lined 70 with vertical helixes of multiple tubes, forming one group of tubes, and a convection chamber through which gases ow downward and which is filled with vertical tubular helixesalternately` right hand and left hand and with oifset cen- 75 ters and having more length of tube per foot of A height in the lower part than in the upper part, forming another group of tubes, all helixes b`eing supplied with liquid of constant head to their lower ends, and being connected to a header at their upper ends, and with the upper end of each group discharging vapor into a separate vapor space in the header for that group and thence, either directly through an adjustable thermostatic valve, or through a manually operated valve into a space in the header in which the pressure is maintained by lsuch an adjustable thermostatic valve responsive to the temperature of the vapor discharged into said space, thus depressing `the liquid within each group of tubular helixes enough to give sufcient .15 vapor lled surface to give the required outlet temperature of vapor above the boiling temperature.

3. In combination, in a complete compact adjustable boiler superheater,for heating a liquid A* to its boiling temperature, evaporating the liquid into vapor and superheating the vapor to the desired temperature above the boiling temperature, y means providing a passage for gases owing in series through, a furnace chamber lined with vertical helixes of multiple tubes, forming one group of tubes, and a convection chamber through which gases flow downward and which is filled with tubular helixes, having more length of tube per foot of height in the lower part than in the upper part, forming another group of tubes, all helixes being supplied with liquid of constant head at their lower ends, and being connected to a header at their` upper ends, and with the upper end of each group discharging vapor into a separate vapor space in the header for that group and thence, either directly through an. adjustable thermostatic valve, or through a manually operated valve into a space I in the header in which the pressure is main- 40 tained by such an adjustable thermostatic valve responsive to the temperature of the vapor dischairged into said space, thus depressing the liquid within each group of tubular helixes enough to give suicient vapor lled surface to give the required loutlet temperature of vapor above the boiling temperature. 4

4. In combination, in a complete compact adjustable boiler superheater, for heating a liquid to its boiling temperature, evaporating the liquid into vapor and superheating the vapor to the desired temperature above the boiling temperature, means providing a passage for gases iiowing in series through, a furnace chamber lined with vertical helixes of multiple tubes, forming 55 one group of tubes, and aconvection chamber through which gases ow downward and which is lled with tubular helixes,- forming-another group of tubes, all helixes being supplied with liquid of constant head at their lower ends, and being connected to a header at their upper ends, and with the upper end of each groupdischarging vapor into a separate vapor space in` the header for that group and thence, either directly through an adjustable thermostatic valve, or through a manually operated Valve into a space in the header in which the pressure is maintained by such an adjustable thermostatic valve responsive to the temperature of vapor discharged into said space, thus depressing the liquid within each group of tubular helixes enough to give suiicient vapor lled surface to give the required outlet temperature of vapor above the boiling temperature.

5. In combination, in a complete compact adjustable boiler superheater, for heating a liquid to its boiling temperature, evaporating-the liquid into vapor and superheating the vapor to the desired temperature above\the boiling temperature, a chamber containing hot gases and vertical helixes-of tubes, forming one group of tubes, ,discharging vapor into a space in a vheader in which the temperature is maintained by an adjustable thermostatic valve, responsive to the temperature of vapor in such space, one or more other chambers containing cooler gases and vertical tubular helixes, forming one or more other groups of tubes, discharging vapor into a separate space, in the header, from each chamber,

the vapor dischargingfrom one group passing through a manually operated valve into the space where the temperature is maintained by the thermostatic valve, thermometers indicating the temperature of vapor in each space.

6. In combination, in a complete compact adjustable boiler superheater, for heating ,a liquid to its bolingftemperature, evaporating the liquid into'vapor and superheating the vapor to the desired temperature above the boiling temperature, means providing a passage for gases owing in series through, a furnace chamber lined with vertical helixes of multiple tubes, forming one group of tubes, and a convection chamber through which the gases iiow downward and which is lled with vertical tubular helixes,.

forming another group of tubes, all helixes being supplied with liquid of suitable head to their lower ends, and connected to a header at their -upper.ends, and with the upper ends of eachw group discharging vapor into a separate vapor space for that group, in 'the header, and with means for separately controlling the flow of vapor through each group of tubes to maintain the desired outlet temperature.

7. In combination, in a complete compact adjustable boiler superheater, for heating a liquid to its boiling temperature, evaporating the liquid into" vapor and superheating the vapor to the desired temperature above the boiling temperature, meanaproviding a passage for gases flowing -in series through, a 'furnace chamber lined with vertical helixes of multiple tubes, forming one group of tubes, receiving liquid from lower headers and discharging vvapor through upper headers into a separate space in a drum, and a convection chamber through which gases ow downward and which is filled with vertical tubular helixes, forming another group of tubes, receiving liquid from lower headers and discharging vapor through upper headers into a separate space in a drum, a manually operated valve for causing a oat valve to open to supply'feed liquid to the lower ends of the helical coils, ooding all helical coils, the upper headers and the drum and washing them out 'through a blow off valve.

W'ILLIAMANTHONY JONES. 

